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  my $newposition = $oldposition =~
    s/\+\K([-\d]+)\+([-\d]+)$/ ($1 + $deltax) . '+' . ($2 + $deltay) /
+er;

  $oldposition =~ /^(\d+)x(\d+)\+?([-\d]+)\+?([-\d]+)/;
  my ($newx, $newy) = ($3 + $deltax, $4 + $deltay);
  my $newposition = "${1}x${2}+${newx}+${newy}"